---

Jeg er ved at udvikle en class som hedder MySqlDbConnect med driveren
org.gjt.mm.mysql.Driver - det virker fint i en servlet via Tomcat.

Men der er problemer med at close en connection - hvis connectionen ikke
bliver lukket, så vil et andet java-program pege på den samme database som
den første.

Men hvis jeg fra et javaprogram skriver db.closeCon(cx), hvor cx er
Connection - så kører det fint i første omgang og db'en bliver disconnected.
Men anden gang jeg kører programmet, får jeg en NullPointerException ....
Hvorfor?

Jeg vedhæfter class MySqlDbConnect så måske kan I finde fejlen

Claus jul Larsen


begin 666 MySqlDbConnect.java
M<&%C:V%G92!D:RYE;F]V87-I;VXN9&(["@II;7!O<G0@:F%V82YS<6PN4W1A
M=&5M96YT.PII;7!O<G0@:F%V82YS<6PN1')I=F5R36%N86=E<CL*:6UP;W)T
M(&IA=F$N<W%L+D-O;FYE8W1I;VX["@IP=6)L:6,@8VQA<W,@37E3<6Q$8D-O
M;FYE8W0@>PH*(" @('-T871I8R!P<FEV871E(%-T<FEN9R!D<FEV97(@/2 @
M(F]R9RYG:G0N;6TN;7ES<6PN1')I=F5R(CL*(" @('-T871I8R!P<FEV871E
M(%-T<FEN9R!U<FP@(" @/2 @(FID8F,Z;7ES<6PZ+R\B.PH@(" @<W1A=&EC
M('!U8FQI8R!#;VYN96-T:6]N(&-X.PH@(" @<W1A=&EC('!U8FQI8R!3=&%T
M96UE;G0@<W1M=#L*"B @(" O+R!'970@82!C;VYN96-T:6]N"B @("!P=6)L
M:6,@<W1A=&EC($-O;FYE8W1I;VX@9V5T0V]N*%-T<FEN9R!S97)V97(L(&EN
M="!P;W)T+"!3=')I;F<@9&(L(%-T<FEN9R!U<V5R+"!3=')I;F<@<&%S<W=O
M<F0I('1H<F]W<R!J879A+G-Q;"Y344Q%>&-E<'1I;VXL(&IA=F$N;&%N9RY#
M;&%S<TYO=$9O=6YD17AC97!T:6]N('L*"@E3=')I;F="=69F97(@9FEN86Q5
M<FP@/2!N97<@4W1R:6YG0G5F9F5R*"D["B @(" @(" @"B @(" @(" @+R\@
M+2!M86ME('1H92!C;VYN96-T('-T<FEN9RX*(" @(" @("!F:6YA;%5R;"YA
M<'!E;F0H('5R;" I.PH@(" @(" @(&9I;F%L57)L+F%P<&5N9"@@<V5R=F5R
M("D["B @(" @(" @"B @(" @(" @:68@*"!P;W)T("$](# @*2!["B @(" @
M(" @(" @(&9I;F%L57)L+F%P<&5N9"@@(CHB("D["B @(" @(" @(" @(&9I
M;F%L57)L+F%P<&5N9"@@<&]R=" I.PH@(" @(" @('T@"B @(" @(" @9FEN
M86Q5<FPN87!P96YD*" B+R(@*3L*(" @(" @("!F:6YA;%5R;"YA<'!E;F0H
M(&1B("D["B @(" @(" @9FEN86Q5<FPN87!P96YD*" B/W5S97(](B I.PH@
M(" @(" @(&9I;F%L57)L+F%P<&5N9"@@=7-E<B I.PH@(" @(" @(&9I;F%L
M57)L+F%P<&5N9"@B)G!A<W-W;W)D/2(I.PH@(" @(" @(&9I;F%L57)L+F%P
M<&5N9"@@<&%S<W=O<F0@*3L*( H)=')Y('L*(" @(" @(" @(" @:68@*&-X
M(#T](&YU;&PI('L*(" @(" @(" @(" @(" @(&QO861$<FEV97(H*3L*(" @
M(" @(" @(" @(" @(&-X(#T@1')I=F5R36%N86=E<BYG971#;VYN96-T:6]N
M*"!F:6YA;%5R;"YT;U-T<FEN9R@I("D["@D)4WES=&5M+F5R<BYP<FEN=&QN
M*" B0V]N;F5C=&5D('1O(&1B+BXN(B I.PH)"0E]"B @(" @(" @?2!C871C
M:"@@17AC97!T:6]N(&4@*7L*(" @(" @(" @(" @4WES=&5M+F5R<BYP<FEN
M=&QN*" B56YA8FQE('1O(&=E="!#;VYN96-T:6]N(#H@(B I.PH@(" @(" @
M(" @("!E+G!R:6YT4W1A8VM4<F%C92@I.PH@(" @(" @('T*(" @(" @("!R
M971U<FX@8W@["B @("!]"B @(" *(" @("\O($QO860@=&AE(&1R:79E<@H@
M(" @<')I=F%T92!S=&%T:6,@=F]I9"!L;V%D1')I=F5R*"D@>PH@(" @( H@
M(" @(" @('1R>2!["B @(" @(" @(" @($-L87-S+F9O<DYA;64H(&1R:79E
M<B I+FYE=TEN<W1A;F-E*"D[( H@(" @(" @('T@8V%T8V@@*"!%>&-E<'1I
M;VX@92 I('L*(" @(" @(" @(" @4WES=&5M+F5R<BYP<FEN=&QN*" B56YA
M8FQE('1O(&QO860@1$(@9')I=F5R(#H@(B I.PH@(" @(" @(" @("!E+G!R
M:6YT4W1A8VM4<F%C92@I.PH@(" @(" @('T*(" @('T*(" @( H)+R\@1&ES
M8V]N;F5C="!T:&4@9&%T86)A<V4*(" @('!U8FQI8R!V;VED(&-L;W-E0V]N
M*$-O;FYE8W1I;VX@8W@I('1H<F]W<R!%>&-E<'1I;VX@>PH)8W@N8VQO<V4H
M*3L*"5-Y<W1E;2YE<G(N<')I;G1L;B@B1&ES8V]N;F5C=&5D(&9R;VT@9&(N
M+BXB*3L*(" @('T*"@DO+R!'970@=&AE(%-13"!S=&%T96UE;G0A"@EP=6)L
M:6,@<W1A=&EC(%-T871E;65N="!G9713=&%T96UE;G0H($-O;FYE8W1I;VX@
M8W@@*2!["B @(" *(" @(" @('1R>2!["B @(" @(" @<W1M=" ](&-X+F-R
M96%T95-T871E;65N="@I.PH)<F5T=7)N('-T;70["B @(" @(" @?2!C871C
M:" H($5X8V5P=&EO;B!E("E["B @(" @(" @(" @(%-Y<W1E;2YE<G(N<')I
M;G1L;B@@(DUY4W%L1&)#;VYN96-T+F=E=%-T871E;65N=" H($-O=6QD;G0@
M9V5T(&$@8V]N;F5C=&EO;B I(#H@(B K(&4N9V5T365S<V%G92@I+G1O4W1R
M:6YG*"D@*3L*(" @(" @("!]"B @("!R971U<FX@<W1M=#L*"GT*"GT*"@H*
""@H`
`
end